AP EAMCET · Maths · Properties of Triangles
In \(\triangle A B C\), if \(a, b, c\) are 5,12 and 13 respectively, then \(b^2 \sin 2 C+c^2 \sin 2 B=\)
- A 60
- B 120
- C 180
- D 90
Answer & Solution
Correct Answer
(B) 120
Step-by-step Solution
Detailed explanation
Given: \(a=5, b=12, c=13\) Thus, \(\mathrm{S}=\frac{a+b+c}{2}=15\) \(\Delta=\sqrt{s(\mathrm{~s}-\mathrm{a})(\mathrm{s}-\mathrm{b})(\mathrm{s}-\mathrm{c})}=\sqrt{15 \times 10 \times 3 \times 2}=30\) Now, \(b^2 \sin 2 C+c^2 \sin 2 B\)…
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